PDF malware analysis — malicious · a8ffce39a3ca97ef

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 00:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: f91ff1de30b7ddae96ea1bf1e2bedc70 SHA-1: 469e64a468c7796628f003dc40ab639e60983cc9 SHA-256: a8ffce39a3ca97ef599c9d192b1c8cdf1263216ba85db8d99b04ceb58218341a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://drafthe.ru/uplcv?utm_term=scam+1992+movierulz PDF link annotation
- http://vhktn.at/images/content/files/xizorowugipufe.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d705c31e9c0ddfe25bc2eb1b55e4a9c7/tufubowijem.pdfIn PDF document text
- http://rsentco.com/upload/file/18207045377.pdfIn PDF document text
- http://mensagemcrista.com.br/ckfinder/userfiles/files/14524239968.pdfIn PDF document text
- http://hotel-ambassador-nice.com/upload/files/34690528822.pdfIn PDF document text
- https://asiarsolutions.com/userfiles/file/73463617808.pdfIn PDF document text
- https://phr4u.com/files/37895220698.pdfIn PDF document text
- https://bluza-shop.ru/content/File/nibunaz.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614708233a20a---sisegawitabujakiruwo.pdfIn PDF document text
- http://asremajazi.com/uploads/files/64819888933.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144837e56ccf---rozokex.pdfIn PDF document text
- http://xn--eyt274i.com/upload/files/wemimewozeberijinosa.pdfIn PDF document text
- http://arc-en-cielproduce.com/ckfinder/userfiles/files/23918741701.pdfIn PDF document text
- https://alcoquimicos.com/ckfinder/userfiles/files/tukikefedefawezal.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614815f286e45---52623080643.pdfIn PDF document text
- http://mitroc.com/userfiles/file/berogugipatoredezafix.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3cf17407b7742cbbf583b0d84028c219/wagifulimumozopuxazezogu.pdfIn PDF document text
- http://lapempi.nl/ckfinder/userfiles/files/82727430096.pdfIn PDF document text
- http://alisawedding.com/upload/users/files/luminasetapunabofomub.pdfIn PDF document text
- http://taociren.com/upload/file/210903172853915752jpueek9cme65.pdfIn PDF document text
- https://kuraniterbiye.com/resimler/files/23699681051.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/kb55k1orfohah0j81rgniijgk9/17810837273.pdfIn PDF document text
- http://grimastone.ru/files/84901121356.pdfIn PDF document text
- http://oppedisanorobertosrl.com/userfiles/files/32842250311.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b707.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB707	10660 bytes
SHA-256: `a240f49cacb2c80d5f5c1e8b570dcb3b4230fa1627602b5a129ed3db5e0c94bf`
`font_01_sfnt_off0000cfa0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFA0	15872 bytes
SHA-256: `9521cc4e0eaa8745a8b8226c2bf5dc090ccab9f693e88b6882cd0e62ac924585`
`font_02_sfnt_off0000f83c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF83C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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